1978-07-29 Netrnoi Sor Vorasingh w rtd 5 (15) Luis Estaba, New Circus Bullring, Caracas, Venezuela - WBC. Referee: Jay Edson. In what was his first defence, Sor Vorasingh (106) gained revenge for a previous loss. Dropping Estaba (107) in the second, putting him down three more times in the fourth and pounding away in the fifth to such an extent, it was no surprise when the challenger’s corner threw the towel in at 1.10 of the session.